* {
    user-select: none;
}

li {
    list-style: none;
}

.list {
    width: 200px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 30px;
    padding: 0;
}

.content {
    margin: 20px 0;
    overflow: hidden;
}

.content h1 {
    background-color: aqua;
    margin: 0;
    padding: 0;
    font-size: 100%;
    font-weight: normal;
    padding: 0 25px;
    cursor: pointer;
}

.content-li {
    background: #e0f0f7;
    padding: 0 30px;
    height: 0;
}